Working Paper Article Version 1 This version is not peer-reviewed

Comparison between Methods for Indirect Assessment of Buildability in Fresh 3D Printed Mortar and Concrete

Version 1 : Received: 20 September 2021 / Approved: 21 September 2021 / Online: 21 September 2021 (09:14:50 CEST)

How to cite: Ivanova, I.; Ivaniuk, E.; Bisetti, S.; Nerella, V.N.; Mechtcherine, V. Comparison between Methods for Indirect Assessment of Buildability in Fresh 3D Printed Mortar and Concrete. Preprints 2021, 2021090352 Ivanova, I.; Ivaniuk, E.; Bisetti, S.; Nerella, V.N.; Mechtcherine, V. Comparison between Methods for Indirect Assessment of Buildability in Fresh 3D Printed Mortar and Concrete. Preprints 2021, 2021090352

Abstract

This paper presents a comparison between indirect methods for assessing the buildability of 3D printed cementitious materials, including CRV or CSR test using rotational rheometry, unconfined uniaxial compression test (UUCT), a newly proposed confined uniaxial compression test (CUCT), and fast penetration test. The experimental program was conducted on the extruded samples of six printable mortars and two printable concretes with various rheological behavior achieved by the use of different additives and admixtures. Predictions of the material failure and the stability failure in hollow cylindrical structures are provided and compared with the results of the direct printing test. Benefits and disadvantages of the employed test methods are discussed, also taking into consideration a perspective of their use for automated in-situ control of the materials’ buildability.

Keywords

3D concrete printing; digital concrete; layered extrusion; fresh concrete rheology; green strength; buildability; rotational rheometry

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